Method for the continuous removal of the scaly matter from hot-rolled, band-like iron products



Nov. 24, 1959 E. THOMAS ET A:.

unmoo FOR THE commuous REMOVAL OF THE SCALY MATTER FROM HOT-ROLLED, B Alfi l )-LIKE mow PRODUCTS 3 Sheets-Sheet 1 Filed Jan. 24, 1956Inventor's fr/vsr 77/0/1451: 4

5FI/NO flue/1v 517%" n) 1959 E. THOMAS ET AL 2,913,808

METHOD FOR THE CONTINUOUS REMOVAL OF THE SCALY MATTER FROM HOT-ROLLED,BAND-LIKE Y IRON PRODUCTS Filed Jan. 24, 1956 :5 Sheets-Sheet 2 m Skfen/s7 77/0MA5 4' Bea/v0 Haw/v 1959 E. THOMAS ET AL ,9

METHOD R THE CONTINUOUS REMOVAL OF THE SCALY TER FROM HOT-ROLLED,BAND-LIKE w IRON PRODUCTS Filed Jan. 24, 1956 3 Sheets-Sheet 3 InventorsfkA/Jr 77904463 United States Patent "ice METHOD FOR THE CONTINUOUSREMOVAL OF THE SCALY MATTER FROM HOT-ROLLED, BAND-LIKE IRON PRODUCTSErnst Thomas and Bruno Auriu, Hemer, Germany, said Auriu assignor toThomas Application January 24, 1956, Serial No. 561,090

Claims priority, application Germany January 26, 1955 4 Claims. (Cl.29-81) This invention relates to a method and plant for the continuousremoval of the scaly matter from hot-rolled, bandlike iron products,which are drawn in the plant over guide rollers and over slide-barsprovided with arcshaped slide surfaces, whereby the slide-bars and guiderollers are adjustably supported in their position and arranged withrespect to one another in undulating orzigzag-like fashion, and wherebythe scaly matter is loosened from the band-iron products by means of aslide-bar arranged in the vertex of a deflecting angle of the ironproducts.

According to the invention the removal of the scaly matter isfacilitated and improved by the feature that band-iron of a thickness of1 to 5 mm. is guided over the slide-bar at a deflecting angle which forband-iron of 1 mm. thickness is approximately 70 degrees and which forevery additional mm. thickness increases at the rate of approximately 10degrees; that the length of the radius of curvature of the band-iron aswell as of the arc-shaped slide surface of the slide-bar isapproximately five times the thickness of the band-iron; and that aportion of the scaly matter fed in by the moving band-iron between theslide surface of the bar and the band surface is crushed by the pressurebetween the slide surface and the band surface and thus utilized as aslide-promoting medium, and thereupon removed from the-band by means ofbrushes.

Because of the comparatively strong deflection of the band the surfaceof the latter is upset beneath the neutral zone, whereby the looseningprocess of the scaly matter is started. The thus loosened scaly matteris then crushed under high pressure between the especially hardened andwear-resisting slide surface or pressure-surface of the slide bar andthe surface of the band. For this it is important that the pressuresurface of the slide-bar is curved according to a comparatively smallradius and that it is of comparatively small width. The are of thepressure surface positioned in the vertex of the deflecting angle is avery short one, so that a strong upsetting pressure and a considerablecrushing of the scaly matter results, while, on the other hand, asharp-edge deflection of the band is reliably avoided. At the same time,the short but strongly rounded-off arc ends of the slide surface of theslide-bar render it possible that a considerable portion of the scalymatter is drawn-in between the pressure surface of the bar and the bandand thereby transformed into a powdery slide-promoting medium, wherebythe removal of the scaly matter with the aid of brushes is facilitatedwithout injurious effects to the surface of the band.

According to the invention the plant for the continuous removal of thescales from band-iron is; provided at the entering end of the band-ironwith guide. rollers equipped with brakes; at the exit end of theband-iron with pull exerting rollers driven from a motor; and in thearea between the aforesaid rollers with additional guide 70 rollers andwith at least one slide-bar provided with means for its adjustment inheight with respect to adjacent in its position. trivances. of this typemay be arranged successively bewith an arc-shaped slide surface havingits radius of curvature correspond in length to approximately five timesthe thickness of the band-iron, whereby the thickness of the slide-baris at least equal to the length of the radius of .curvature of the slidesurface, but smaller than twice the length of that radius. The inventionfurther proposes to arrange the slide-bar exchangeably in a guide slotof a supporting body, and to provide the supporting body with meansadapted to clampingly secure the slide bar According to the inventiontwo conhind each other, so that the scaly matter can be successivelyremoved from both of the faces of the band. The slidebar shouldpreferably consist of hard metal.

' It has further been found that'the aforedescribed meth- 0d and plantare also well suited for producing, simula brake rollers at the enteringend and the pull exerting rollersat the exit end of the plant a tensilestress in such manner that, with the aid of the slide-bars, the band isthereby stretched beyond its range of elasticity and thus reduced inthickness for 20 to 30%.

ln cases in which, in addition to the removal of the scaly matter, theband is to be stretched for a reduction of its thickness, the inventionproposes to arrange in the plant a plurality of slide bars or pressurebars successively behind one another, that is to say, alternately on theupper surface and lower surface of the band, so that the band is pulledsuccessively a plurality of times over such slide bars or pressure bars.In conformity with the reduction in thickness thus obtained, the angleof deflection is then adjusted in such manner that it is more acutetoward the exit end than toward the entering end of the band. a v

For the production of considerable reductions in thickmess it is thenpossible to pass the band a plurality of times through the samecontrivance or through a plurality of similar contrivances successivelyarranged bebe subjected to heat-treatment.

Additi'onal features and advantages of the invention will be understoodfrom a consideration of the following detailed description taken inconnection with the accompanying drawings, forming a part of thisspecification and in which an embodiment of the invention has been shownby way of example; However, we wish to say that the invention is notconfined to any strict conformity with the showing of the drawings, butmay be changed or modified, so long as such changes or modificationsmark no material departure from the salient features of the invention asexpressed in the appending claims.

In the drawings, in which like parts have been referred to by the samereference numerals in all of the several Fig. 1 is a central verticalsection of a plant for the removal of scaly matter from band-iron, thatis to say,

"Fig."4is"a* diagrammatic illustration, showing aplu- 1 Patented Nov.24, 1959 rality of slide-bars or'pr'essurebars successively arrangedbehind"on'e"another'in zig-zag fashion between the brake rollers at theentering end and pull exerting rollers at the exit end of the band-iron;v M h Fig. is a detail view, on an; enlarged s'c'alef, showing avertical cross-section through the upper end of the slide-bar p V v,

Referring now to the drawings in detail; the reference numeral l (seeFigs. 1 and2) designates the bandfiron oi" sheet metal'riirin'ing' off areel (not'illustrated in the drawings) and passing first between the"pair of feed rollers 2', of'which at least one is driven from a'motor;By means" of, these feed rollers 2 the band-iron is fed throu'g'li thebrake rollers 3. In the embodiment illustrated" in the drawings theinvention provides five brake rollers, some of which are'braked eitherdirectly or at their ends. These rollers simultaneously serve as a meansfor the straightening or flattening of the band-iron. In'thedrawingthe'braking of the 'rollers 3 is effected with'the aid of th e'diagrammatically illustrated'braking means4. The brake power may. beadapted for adjustnient hj means of spring pressure. From these rollers3 th'e band iron passes'into' the plant section 5 in which:

for the guidance of the band the rollers 6, 7, 8 and 9 are accommodated;Arranged between the rollers 7 and 8; one supporting body" 10, is aslide-bar'll; The suppor'tingbody ltl'isvertically adjustable" bymeansof the spindle 12. The rollers"-7 and 8 are adapted for adjustment invertical direction by means of the spindles 13.- Positioned beneath therollers'8 is a brush 14 driven from a'mo'tor 15. The band-iron 1' isguided via the rollers 6,17. 8,- 9' and'the slide-bar 11 in zig-zag-likefashion, whereby'it is importantthat the band, in dependence upon itsthickness, is deflected to such an extent that between the tw'obandportions a and b an anglex is formed, which is'adapted for adjustmentbetween' 70 'de'grees" and 120 degrees. Fromthepla'nt sec tion'5 theband-iron then passesinto the plant section 16in which the band isguided over a plurality'of rollers 17,' 18,".19; 20; 21 in'undulating"fashion; and whereby beneath therollers 18 and 20 the brushes '22 and'23 are' arranged which are'driven from the motor 24. From the'plant'se'c'tion 16 the band passesinto the plant section 25."Accommo'dated "in this sectionare the motor-driven rollers 26 aroundwhich 'the'b'and passes in'such manner that the rollers 26 are therebycaused to pull the band through the entirescale-removing'plant; thatis'to say, against the 'brake resistanceof the brake rollers 3.

The'device as illustrated in Fig; 1 serves the purpose of'removingthe'scales from one face-of the baud. For

the removal of the'scales'from'the other'face'of the band the latter maybe passed asecond time through the'contriva'nce 'of Fig. 1.- However, inthiscas'e, the

band haslto be turned 'firs't'through an angle of 180- degrees, so thatthe'sideofthe band which at'first was" downis then up. For thecontinuous removal of the scalesfrom both sides of the band; the latterhas to suc-" ces'sively pass also through the contrivance shown in- Fig2 of the drawings.

The construction of the portionof-l'th'e plant shown in Fig. 2corresponds subst'antially" to the construction of the plant-portionillustrated in'Fig'.

1. The only diiferencebeing that in-the plant-section 27 the guiderollers and the brush-are somewhat differently arranged or adjusted,"andthat the slide-bar or pressure bar 11 and its supporting body lll'areadjusted by'means ofathe upwardly extending .spindle 12, so thatthepress'ure" oflthe barFll .is exerted upon the upper face of thebandiron, and th at the angle x formed by the band portions a and b isopen in upwarddirectiori. The brush -14,- in

thiscase, ispositioned above the guide roller 8. Infthe plant-section 28the brushes are likewise arranged above" the rollers, as in-this casethe upper face of the band has to be brushed.

The slide-bars ll' arranged "in" the aforesaid warring sections 5.and.27consist of hard metal and are provided with a slide surface 29 forming asection of an arc of a circle (see Fig; 5). The radius r of'thisarc-shapedslide surface is approximately five times the length of thethickness s of the band-iron. The thickness y of the slide-bar 11 shouldexceed in length the length of the radius r, but should be shorter than"the double length of the radius. The slide surface 29 is at its endslikewise of curved formation and; therefore, merges without edges intothe vertically extending side walls of the slide-bar. As shown in Fig.3, the bar 11 is mounted in a recess 30' of thestationa'ry supportingbody 10and secured in its position by the pressure exerted against it bya detachable bar 31 adapted'for tensioning' by means of screws 32. The.supporting body 10 is fastened by means of screws 33 on supportingmeans which, with the aid of guiding means 34 (see Fig. 1'), areshiftably adjustable in vertical direction in the machine frame. Theslide-bar 11 is exchangeably supported between the supporting body 10and the supporting and tensioning bar 31. The exchange of the bar isnecessary whenever band-iron of a different thickness s has to betreated for the removal ofthe scales asin this case slide-bars of adifferent thickness y' and different slide surface 29 are needed. Itwill be seen that by means of the detachable and adjustable bar 31slide-bars of-var ious thicknesses can be arranged in-therecess orslot30. I g

In the embodiment as hereinbefore described the removal of the scalesfrom the band-iron proceeds as folthe surface of the slide-bar 11'arranged in the plantsection 5. The band, therefore, is continuouslypulled in conformity with its adjusted feeding speed and at acomparatively small angle over the curved surface 29 of the bar11'1. Thesmall are formed between the band portions a and]; is equally large asor slightly larger than the are 29, so that the scaly matter is fed bythe movement of the band between the surface 29 and the inner face ofthe band. Because of the high pressure the scaly matter not yetseparated from the band is crushed and thus serves as a slide promotingmedium for the band in the small area of contact between the slide-bar11 and the band. This powdery and now completely loosenedscaly mattercan thereupon easily be removed by the'brush'es 14, 22, 23 which theband subsequently passes, sot hata perfectly clean and completelyuninjured band surface is obtained.

For carrying'out the invention-the following dimensions' are-preferablyemployed, whereby s is the thickness of' thfejband, r the radius ofcurvature of the slide-bar,

and-x theangle of defiectionof the band:

Fig. S shows clearlyfthat the bar 11 does not rest with any-sharp edgeagainst the inner face of the band, and

that-the scalymatter is pulled or fed into a substantially wedge-likegap formed between the upper surface of the bar and the inner face ofthe baud, whereby the scaly matter is crushed and completely loosenedfrom the hand, without injurious effect to; the inner face of the band.

The device as illustrated in Figs. 1 and 2 of the drawingsis also wellsuited for reducing, simultaneouslywith theremoval of the scales, thethickness s of the band iron. h Through alteration of the brakeresistance of the rollers 3 and with the aid of a corresponding force ofpull provided at the rollers 26 his possible to subject the band-iron inthe area of the slide-bar 11 to such a degree of tensioning that aplastic deformation is proalso a uniform one. The scaly matter utilizedas a slidepromoting medium facilitates the orderly operation of thedevice and prevents the band-iron from getting stuck at the bar 11.

For reducing the thickness of the band it is also possible to devise theplant as diagrammatically illustrated in Fig. 4 of the drawings. Forthis purpose the invention proposes to arrange in-the plant-sections 5or 27 a plurality of slide-bars 11 in zig-zag-relation with respect toone another, so that alternately the upper face or lower face of theband is treated. In order to take care of the ensuing reduction inthickness of the band it is then advisable to arrange the deflectingmeans 11 in such manner that the angle x is more acute in the directiontoward the pull exerting rollers 26, Le. that the angle x is smallerthan the angle x.

What we claim as new and desire to secure by Letters Patent of theUnited States is: 1 v

1. A method for the continuous separation of scale from the surfaces ofhot-rolled sheet iron band comprising guiding and pulling the sheet ironband in zigzag formation under tension over a stationary and adjustablecurved slide surface, pulling the band over the curved slide surface atan angle having long legs and adjustable by moving the slide surfacewith the angle depending upon the thickness of the band and which isapproximately 70 to 110 for a thickness of 1 to 5 mm., the crown widthof the curved slide surface being in contact with the surface of thesheet iron with the radius of curvature only a few times greater inlength than the thickness of the band so that the slide surface extendsbetween approximately vertical side surfaces with the distancedetermined by the curvature radius of the slide surface, and thisdistance being at least thesame but smaller than double its radius ofcurvature, so that a part of the scale separated from the sheet ironwill be drawn along the sheet iron and crushed between it and the slidesurface and emerges from the slide surface, and finally removing thescale from the band surface.

2. A method for the continuous removal of scaly matter from the surfacesof hot-rolled iron according to claim 1, in which the step is includedof imparting a tensile stress simultaneously on the band with theremoval of the scaly matter to produce a reduction in thickness of theband by passing the band over said slide surface of the bar with suchtensile stress that the band is thereby stretched beyond its elasticlimit.

3. A method for the continuous removal of scaly matter from the surfacesof hot-rolled iron according to claim 1, in which the step is includedof imparting a tensile stress simultaneously on the stressed band withthe removal of the scaly matter to produce a reduction in thickness ofthe band by passing the band over said slide surface with such tensilestress that the band is thereby stretched beyond its elastic limit, andreduced in thickness in conformity with the adjusted degree of tensilestress by 20 to 30 percent.

4. Method for the continuous removal of scaly matter from the surface ofhot-rolled iron bands, comprising pulling the bands under tension inzigzag formation over a stationary and adjustable arc-shaped slidesurface with the surface forming an angle of deflection in the bandrelative to the vertex and adjusting the angle of deflection toapproximately degrees for 1 mm. thick- .ness of the band increasing forevery additional mm.

band thickness up to 5 mm. by approximately 10 degrees, and the radiusof curvature of said slide surface corresponding in length toapproximately five times the thickness of the band, utilizing the scalymatter created by the passing band as a slide promoting medium betweenthe slide surface and the band and loosened and crushed to a powderysubstance by the force between the slide surface and the band, andbrushing and removing the powdery substance from the band.

References Cited in the file of this patent UNITED STATES PATENTS988,712 Hughes Apr. 4, 1911 1,584,674 Smith May 11, 1926 2,116,980 NaishMay 10, 1938 2,256,520 Johansen Sept. 23, 1941 2,318,432 Stanier May 4,1943 2,335,196 Pecsok Nov. 23, 1943 2,359,095 Elder Sept. 26, 19442,391,499 Yoder Dec. 25, 1945 2,790,229 Hellstrom Apr. 30, 1957 FOREIGNPATENTS 1,632 Great Britain Jan. 22, 1904 10,618 Great Britain May 9,1904 22,055 Sweden Nov. 2, 1905

